Modified Proctor test uses which hammer weight?

Modified Proctor test uses which hammer weight?

• A. 5 1/2 lb Hammer
• B. 10 lb hammer
• C. 15 lb hammer
• D. 2 lb hammer

Answer: (B)

In the Modified Proctor test, the energy delivered to the soil is increased by using a heavier hammer dropped from a greater height, which lets you achieve a higher maximum dry density. The hammer weight defined for this test is 10 pounds, dropped from 18 inches. This combination provides the extra compaction energy needed for soils that require more intense compaction. By contrast, the standard Proctor uses a lighter hammer (5.5 pounds) dropped from 12 inches, which yields less energy. The other weights listed would not follow the standard Modified Proctor setup, as they do not match the defined energy requirements.

In the Modified Proctor test, the energy delivered to the soil is increased by using a heavier hammer dropped from a greater height, which lets you achieve a higher maximum dry density. The hammer weight defined for this test is 10 pounds, dropped from 18 inches. This combination provides the extra compaction energy needed for soils that require more intense compaction. By contrast, the standard Proctor uses a lighter hammer (5.5 pounds) dropped from 12 inches, which yields less energy. The other weights listed would not follow the standard Modified Proctor setup, as they do not match the defined energy requirements.